linux-kernel - [PATCH 0/9] x86,objtool: Optimize !RETPOLINE

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Date:   Fri, 12 Mar 2021 18:16:13 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, jpoimboe@...hat.com, jgross@...e.com,
        mbenes@...e.cz
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: [PATCH 0/9] x86,objtool: Optimize !RETPOLINE

Hi,

Now that Juergen's paravirt rework, which included the negative alternative
stuff, landed in tip, here's a respin of my retpoline patches.

The main feature is replacing the compiler generated (tail) calls to
__x86_indirect_thunk_\reg with an ALTERNATIVE that replaces them with regular
indirect call instructions, eliding the double jump.

Patches rely on tip/objtool/core and tip/x86/alternatives